Hmm seems like a board probleam maybe a sh2 error or dry joint or something like that i never had that probleam i have had freezeing saturns playing sonic jam half way though a game the console freezes would like to know how to fix that aswell.
My feedback thread, since it seems somewhat difficult for people to find.
I heard it was a video ram problem, aint got a clue where it is and how to fix it
Open it and clean it up.
That surely look like RAM problem on the VDP1.
Play something like DAYTONA USA and observe where the pixels appear on the 2D surfaces or 3D models.
If it shows up on the cars, tunnels or the road surface, it's on the VDP1 memory, otherwise it's the VDP2 memory.
Ok I fire up Daytona and feed back the results.
Either way is it a simple fix do you know?
Fix will be replace whatever RAM chip is faulty. No quick fix for that. Sorry to bring the bad news.